WO2021118209A1 - Ensemble électrode, batterie secondaire et son procédé de fabrication - Google Patents

Ensemble électrode, batterie secondaire et son procédé de fabrication Download PDF

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Publication number
WO2021118209A1
WO2021118209A1 PCT/KR2020/017874 KR2020017874W WO2021118209A1 WO 2021118209 A1 WO2021118209 A1 WO 2021118209A1 KR 2020017874 W KR2020017874 W KR 2020017874W WO 2021118209 A1 WO2021118209 A1 WO 2021118209A1
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Prior art keywords
electrode
diffusion prevention
crack diffusion
coating
prevention hole
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PCT/KR2020/017874
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English (en)
Korean (ko)
Inventor
이우용
김동명
강경원
Original Assignee
주식회사 엘지에너지솔루션
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Priority to US17/776,064 priority Critical patent/US20220384922A1/en
Priority to EP20899074.7A priority patent/EP4050725A4/fr
Priority to JP2022521495A priority patent/JP7351454B2/ja
Priority to CN202080077556.4A priority patent/CN114651371B/zh
Publication of WO2021118209A1 publication Critical patent/WO2021118209A1/fr

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/572—Means for preventing undesired use or discharge
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/10—Primary casings; Jackets or wrappings
    • H01M50/172—Arrangements of electric connectors penetrating the casing
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/04—Construction or manufacture in general
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/04—Construction or manufacture in general
    • H01M10/0413—Large-sized flat cells or batteries for motive or stationary systems with plate-like electrodes
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/04—Construction or manufacture in general
    • H01M10/0436—Small-sized flat cells or batteries for portable equipment
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/05—Accumulators with non-aqueous electrolyte
    • H01M10/058—Construction or manufacture
    • H01M10/0585—Construction or manufacture of accumulators having only flat construction elements, i.e. flat positive electrodes, flat negative electrodes and flat separators
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
    • H01M10/4235—Safety or regulating additives or arrangements in electrodes, separators or electrolyte
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M4/00—Electrodes
    • H01M4/02—Electrodes composed of, or comprising, active material
    • H01M4/62—Selection of inactive substances as ingredients for active masses, e.g. binders, fillers
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/10—Primary casings; Jackets or wrappings
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/10—Primary casings; Jackets or wrappings
    • H01M50/116—Primary casings; Jackets or wrappings characterised by the material
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/528—Fixed electrical connections, i.e. not intended for disconnection
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/531—Electrode connections inside a battery casing
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/531—Electrode connections inside a battery casing
    • H01M50/533—Electrode connections inside a battery casing characterised by the shape of the leads or tabs
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/10—Primary casings; Jackets or wrappings
    • H01M50/102—Primary casings; Jackets or wrappings characterised by their shape or physical structure
    • H01M50/105—Pouches or flexible bags
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/10—Primary casings; Jackets or wrappings
    • H01M50/172—Arrangements of electric connectors penetrating the casing
    • H01M50/174—Arrangements of electric connectors penetrating the casing adapted for the shape of the cells
    • H01M50/178—Arrangements of electric connectors penetrating the casing adapted for the shape of the cells for pouch or flexible bag cells
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/531—Electrode connections inside a battery casing
    • H01M50/54—Connection of several leads or tabs of plate-like electrode stacks, e.g. electrode pole straps or bridges
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10—Energy storage using batteries
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
    • Y02P70/50—Manufacturing or production processes characterised by the final manufactured product

Definitions

  • the present invention relates to an electrode assembly in which disconnection of an electrode tab is suppressed, a secondary battery, and a method for manufacturing the same.
  • a secondary battery refers to a battery capable of charging and discharging unlike a primary battery that cannot be charged, and such secondary batteries are widely used in high-tech electronic devices such as phones, notebook computers, and camcorders.
  • the secondary battery is classified into a can-type secondary battery in which the electrode assembly is embedded in a metal can, and a pouch-type secondary battery in which the electrode assembly is embedded in a pouch.
  • the pouch-type secondary battery includes an electrode assembly, an electrode lead coupled to the electrode assembly, and a pouch accommodating the electrode assembly in a state in which the tip of the electrode lead is withdrawn to the outside, wherein the electrode assembly includes an electrode and a separator It has a structure that is alternately stacked. And the electrode includes a coating portion coated with an electrode active material and an electrode tab portion without an electrode active material.
  • the pouch-type secondary battery has a problem in that cracks occur at the interface between the coating part and the electrode tab part included in the electrode, and thus the coating part and the electrode tab part are disconnected. That is, the electrode lead is fixed to the pouch, and the electrode tab portion is fixed to the electrode assembly, so that the electrode tab portion has a state in which tension is applied. In such a state, when the electrode assembly flows by an external force, there is a problem in that a crack is generated at the interface between the coating part included in the electrode and the electrode tab part and the wire is disconnected.
  • the present invention was invented to solve the above problems, and the present invention includes a crack diffusion prevention part on the interface between the coating part provided on the electrode and the electrode tab part, thereby generating cracks on the interface between the coating part and the electrode tab part.
  • An object of the present invention is to provide an electrode assembly, a secondary battery, and a method for manufacturing the same, which can prevent cracks, can prevent diffusion even when cracks occur, and thus can prevent disconnection of the electrode tab portion to increase safety.
  • the electrode assembly of the present invention includes an electrode having a coating portion coated with an electrode active material and an electrode tab without an electrode active material, wherein the electrode includes a crack diffusion prevention portion, and the crack diffusion prevention portion is disposed on the electrode It may include a crack diffusion prevention hole to be formed, and an insulating coating layer provided on a main surface of the crack diffusion prevention hole.
  • the crack diffusion prevention hole may be formed on a boundary line between the coating portion provided on the electrode and the electrode tab.
  • the insulating coating layer may include an inner coating portion provided on the inner circumferential surface of the crack diffusion prevention hole, and an outer coating portion integrally connected to the inner coating portion and provided on upper and lower outer surfaces of the crack diffusion prevention hole.
  • the outer surface of the outer coating may have a gear shape in which grooves and protrusions are alternately formed.
  • the insulating coating layer has a thickness of 10 ⁇ m ⁇ 15 ⁇ m, the outer coating portion may have a greater thickness than the inner coating portion.
  • a curved portion is formed at both ends of the boundary line between the coating portion and the electrode tab,
  • the crack diffusion prevention hole may be provided at a point 2.0 to 5.0 mm apart from the curved portion where the end of the boundary line is located.
  • the crack diffusion prevention part may further include a reinforcing coating layer coated on a boundary line between the coating part and the electrode tab and connected to the insulating coating layer.
  • the crack diffusion prevention hole has a circular or oval shape with a size of 0.5 mm to 2.0 mm.
  • the secondary battery of the present invention is an electrode assembly; an electrode lead coupled to the electrode tab of the electrode assembly; and a battery case accommodating the electrode assembly in a state in which an end of the electrode lead is drawn out.
  • the secondary battery manufacturing method of the present invention comprises the steps of (a) preparing an electrode including a coating portion coated with an electrode active material and an electrode tab without an electrode active material; (b) manufacturing a crack diffusion prevention unit for preventing crack diffusion in the electrode; (c) manufacturing an electrode assembly by alternately stacking the electrode and the separator; (d) coupling an electrode lead to an electrode tab of an electrode included in the electrode assembly; (e) accommodating the electrode assembly in a battery case with the end of the electrode lead drawn out to the outside, wherein in step (b), the crack diffusion prevention part is between the coating part and the electrode tab included in the electrode. It may be provided on the boundary line of
  • the step (b) is a process of drilling a crack diffusion prevention hole for preventing crack diffusion in a boundary line between the coating part and the electrode tab, and a process of coating an insulating coating layer in a form surrounding the inner circumferential surface of the crack diffusion prevention hole Through this, it is possible to manufacture a crack diffusion prevention unit.
  • a curved portion is formed at both ends of the boundary line between the coating portion and the electrode tab,
  • the crack diffusion prevention hole may be formed in a size of 0.5 to 2 mm at a point spaced apart from the curved portion where the end of the boundary line is located by 2.0 mm to 5.0 mm.
  • the step (b) may further include bonding the insulating coating layer to the electrode by simultaneously pressing the upper and lower surfaces of the electrode on which the insulating coating layer is located.
  • the step (b) may further include a step of coating a reinforcing coating layer along a boundary line between the coating part and the electrode tab after preparing an insulating coating layer on the electrode.
  • the electrode assembly of the present invention includes a crack diffusion prevention part on the electrode, wherein the crack diffusion prevention part includes a crack diffusion prevention hole and an insulating coating layer. Due to such a characteristic, it is possible to prevent cracks from occurring in the electrode, and even when cracks occur, it can be prevented from spreading, and as a result, the electrode can be prevented from being disconnected, thereby improving safety.
  • the electrode assembly of the present invention includes an insulating coating layer that protects the crack diffusion prevention hole, the external shape of the crack diffusion prevention hole can be stably maintained, and as a result, crack generation and diffusion can be stably prevented.
  • the crack diffusion prevention hole is formed on the boundary line between the coating portion provided on the electrode and the electrode tab. That is, there is a high possibility of cracks occurring on the boundary line between the coating portion and the electrode tab provided on the electrode, and accordingly, a crack diffusion prevention hole is formed on the boundary line between the coating portion and the electrode tab to prevent disconnection between the coating portion and the electrode tab. can be prevented
  • the insulating coating layer is characterized in that it includes an inner coating portion and an outer coating portion. Due to such a feature, both the inner peripheral surface and the outer surface of the crack diffusion prevention hole can be protected, and in particular, the external appearance of the crack diffusion prevention hole can be stably maintained.
  • the outer surface of the outer coating is characterized in that it has a gear shape in which grooves and protrusions are alternately formed. Due to this characteristic, cracks generated between the coating part and the electrode tab are introduced into the grooves formed on the outside of the outer coating part, and accordingly, the cracks introduced into the grooves of the outer coating part do not spread anymore, so it is possible to prevent crack spread.
  • the outer coating portion has a greater thickness than the inner coating portion. Due to such a characteristic, it is possible to stably protect the crack diffusion prevention hole from external impact, and it is possible to stably maintain the external appearance of the crack diffusion prevention hole.
  • the crack diffusion prevention hole is formed at a position 2.0 to 5.0 mm apart from the curved portion where the end of the boundary line formed between the coating portion and the electrode tab is located. Due to such a feature, it is possible to quickly block the crack diffusion occurring in the curved portion between the coating portion and the electrode tab while minimizing the weakening of strength between the coating portion and the electrode tab by the crack diffusion prevention hole.
  • the electrode assembly of the present invention is characterized in that it includes a reinforcing coating layer coated on the boundary line between the coating part and the electrode tab. Due to such a characteristic, the strength of the boundary line between the coating part and the electrode tab can be reinforced, and as a result, cracks can be prevented.
  • FIG. 1 is a perspective view showing an electrode assembly according to a first embodiment of the present invention
  • Figure 2 is a perspective view showing an electrode of the electrode assembly according to the first embodiment of the present invention.
  • Figure 3 is a partially enlarged view of Figure 2;
  • Fig. 4 is a cross-sectional view of Fig. 3;
  • FIG. 5 is a perspective view illustrating a secondary battery according to a second embodiment of the present invention.
  • FIG. 6 is a flowchart illustrating a method for manufacturing a secondary battery according to a second embodiment of the present invention.
  • FIG. 7 is a process diagram illustrating a method for manufacturing a secondary battery according to a second embodiment of the present invention.
  • FIG. 8 is a partial plan view showing an electrode assembly according to a third embodiment of the present invention.
  • FIG. 9 is a partial plan view showing an electrode assembly according to a fourth embodiment of the present invention.
  • FIG. 10 is a partial plan view showing an electrode assembly according to a fifth embodiment of the present invention.
  • FIG 11 is an image and graph showing the experimental results according to Experimental Example 1 of the present invention.
  • FIG 13 is an image showing experimental results according to Experimental Example 3 of the present invention.
  • the electrode assembly according to the first embodiment of the present invention has a structure including a crack diffusion preventing part, and thus it is possible to suppress the occurrence of cracks in the electrode assembly, and to prevent the spread of cracks even when cracks occur, thereby preventing the occurrence of a disconnection accident. can be prevented
  • the electrode assembly 100 has a structure in which a plurality of electrodes 110 are alternately stacked with a separator interposed therebetween, as shown in FIGS. 1 to 4 .
  • the electrode 110 includes a coating part 111 coated with an electrode active material, and an electrode tab 112 connected to one surface of the coating part 111 and having a width smaller than that of the coating part 111 and having no electrode active material. include A curved portion 113 is formed at both ends between the coating portion 111 and the electrode tab 112 to prevent cracks.
  • the plurality of electrodes 110 may be an anode and a cathode, and the anode and the cathode are alternately stacked with a separator interposed therebetween.
  • the electrode 110 includes a crack diffusion prevention unit 130 for preventing crack diffusion on a surface with a high possibility of cracking, and the crack diffusion prevention unit 130 includes an effective stress generated in the electrode 110 . to suppress the occurrence of cracks, while preventing the spread of cracks generated in the electrode 110 to prevent disconnection of the electrode.
  • the crack diffusion prevention part 130 includes a crack diffusion prevention hole 131 formed in the electrode 110 , and an insulating coating layer 132 provided on an inner circumferential surface of the crack diffusion prevention hole 131 .
  • the crack diffusion prevention hole 131 is formed on the boundary line O between the coating portion 111 provided on the electrode 110 and the electrode tab 112 .
  • the boundary line O between the coating portion 111 and the electrode tab 112 provided on the electrode 110 is easily cracked due to an external impact, and due to the crack, the coating portion 111 and the electrode There was a problem that the tab 112 was disconnected.
  • the present application forms a crack diffusion prevention hole 131 on the boundary line O between the coating portion 111 and the electrode tab 112 , and reinforces the strength of the crack diffusion prevention hole 131 .
  • An insulating coating layer 132 is provided.
  • the crack diffusion prevention unit 130 prevents crack diffusion by blocking the diffusion of cracks generated at the boundary line O between the coating unit 111 and the electrode tab 112 through the crack diffusion prevention hole 131 .
  • cracks may occur in the crack diffusion prevention hole 131 by external force, but cracks are prevented from occurring in the crack diffusion prevention hole 131 by protecting the inner peripheral surface of the crack diffusion prevention hole 131 through the insulating coating layer 132 .
  • the insulating coating layer 132 may reinforce the strength of the boundary line O between the coating portion 111 and the electrode tab 112 , and accordingly, the boundary line O between the coating portion 111 and the electrode tab 112 . By preventing deformation of cracks, the occurrence of cracks can be greatly reduced.
  • the insulating coating layer 132 is integrally connected to the inner coating portion 132a provided on the inner circumferential surface of the crack diffusion prevention hole 131 and the inner coating portion 132a, and the crack diffusion prevention hole 131 ) includes an outer coating portion (132b) provided on the outer upper and lower surfaces.
  • the insulating coating layer 132 can protect both the inner peripheral surface and the outer surface of the crack diffusion prevention hole 131 , and thus can effectively reinforce the strength of the crack diffusion prevention hole 131 , in particular, It is possible to significantly prevent cracks from occurring in the crack diffusion prevention hole 131 .
  • the insulating coating layer 132 has a thickness of 10 ⁇ m ⁇ 15 ⁇ m, the outer coating portion 132b has a greater thickness than the inner coating portion (132a). That is, cracks are generated by deformation such as torsion of the electrode, and accordingly, the thickness of the outer coating portion 132b coated on the outer surface of the crack diffusion prevention hole 131 is formed to be large, so that the crack diffusion prevention hole 131 is formed. The strength of the outer circumferential surface is greatly increased, thereby preventing the crack diffusion prevention hole 131 from being deformed. Meanwhile, since the inner coating portion 132a is for reinforcing the insulation of the crack diffusion prevention hole 131 , it is formed to have a smaller thickness than the outer coating portion 132b to reduce costs.
  • the crack diffusion prevention hole 131 is provided at a point spaced apart by a predetermined distance ⁇ from the curved portion 113 formed at both ends of the boundary line O between the coating portion 111 and the electrode tab 112 . do. That is, the crack diffusion prevention hole 131 is provided at a point 2.0 to 5.0 mm apart from the curved portion 113 where the end of the boundary line O is located. That is, when the position of the crack diffusion prevention hole 131 is provided at a point spaced apart from the curved portion 113 by 2.0 mm or less, the curved portion 113 and the crack diffusion prevention hole ( 131), there is a problem that the gap is easily cut.
  • the crack diffusion prevention hole 131 is positioned at a point spaced apart from the curved portion 113 by 5.0 mm or more, there is a problem in that irregular cracks occurring in the curved portion 113 cannot be blocked. Therefore, the crack diffusion prevention hole 131 is provided at a point 2.0 to 5.0 mm apart from the curved portion 113 where the end of the boundary line O is located, and accordingly, the curved portion 113 and the crack diffusion prevention hole 131 are provided. ), and at the same time, it is possible to stably block even the irregular cracks generated in the curved part 113 at the same time.
  • the crack diffusion prevention hole 131 may be formed in a circular shape having a size of 0.5 mm to 2.0 mm. Accordingly, even irregular cracks generated in the curved portion 113 can be stably blocked.
  • the electrode assembly 100 of the present invention includes the crack diffusion prevention unit 130, it is possible to suppress the occurrence of cracks in the electrode, and even if cracks occur, the diffusion can be blocked, thereby preventing the disconnection accident in advance.
  • the secondary battery 10 As shown in FIG. 5 , the secondary battery 10 according to the second embodiment of the present invention has an electrode assembly 100 and an electrode lead 200 coupled to the electrode tab 112 of the electrode assembly 100 . , and a battery case 300 accommodating the electrode assembly 100 in a state in which the end of the electrode lead 200 is withdrawn to the outside.
  • the secondary battery 10 includes a crack diffusion prevention unit that prevents the spread of cracks generated in the electrode included in the electrode assembly, and safety through the crack diffusion prevention unit can increase
  • the electrode assembly 100 of the secondary battery 10 has a structure in which a plurality of electrodes 110 are alternately stacked with a separator interposed therebetween, the electrodes 110 It includes a coating part 111 coated with a silver electrode active material, and an electrode tab 112 connected to one surface of the coating part 111 and having a smaller width than the coating part 111 and having no electrode active material.
  • a curved portion 113 is formed at both ends between the coating portion 111 and the electrode tab 112 to prevent cracks.
  • the electrode 110 includes a crack diffusion prevention part 130 at the boundary line O between the coating part 111 and the electrode tab 112 , and the crack diffusion prevention part 130 is the electrode 110 . ) to prevent crack spread by blocking the progress of cracks generated at the boundary line (O), thereby preventing disconnection of the electrode.
  • the electrode assembly 100 has the same configuration and function as the electrode assembly described in the first embodiment, and thus overlapping description will be omitted.
  • the secondary battery 10 according to the second embodiment of the present invention can block the spread of cracks generated in the electrode 110 , thereby preventing disconnection of the electrode.
  • the method for manufacturing a secondary battery according to a second embodiment of the present invention includes (a) preparing an electrode including a coating portion coated with an electrode active material and an electrode tab without an electrode active material , (b) manufacturing a crack diffusion preventing part for preventing crack diffusion in the electrode, (c) manufacturing an electrode assembly by alternately stacking the electrode and a separator, (d) an electrode included in the electrode assembly coupling the electrode leads to the electrode tabs of (e) accommodating the electrode assembly in a battery case with the ends of the electrode leads drawn out.
  • Step (a) is to prepare an electrode, and a current collector having an uncoated region formed on one surface is prepared.
  • the connection part between the uncoated part and the current collector is formed as a curved part 113 .
  • the electrode active material is coated on the surface of the current collector except for the uncoated region.
  • the electrode 110 including the coating portion 111 coated with the electrode active material and the electrode tab 112 that is the uncoated portion without the electrode active material may be manufactured. Meanwhile, in the electrode 110 , a boundary line 0 is formed while a step (ie, a step formed by the thickness of the electrode active material) is formed between the coating part 111 and the electrode tab 112 .
  • the electrode 110 may include a first electrode 110A and a second electrode 110B, wherein the first electrode 110A may be an anode, and the second electrode 110B may be a cathode.
  • Step (b) is for manufacturing a crack diffusion prevention part, and drilling a crack diffusion prevention hole 131 for preventing crack diffusion in the boundary line O between the coating part 111 and the electrode tab 112 . and coating the insulating coating layer 132 by applying an insulating coating material to surround the inner circumferential surface of the crack diffusion prevention hole 131 .
  • the crack diffusion prevention part 130 including the crack diffusion prevention hole 131 and the insulating coating layer 132 may be manufactured.
  • the crack diffusion prevention part 130 is provided on the boundary line O between the coating part 131 and the electrode tab 112 included in the electrode 110 where cracks easily occur due to deformation.
  • the crack diffusion prevention part 130 is positioned to be spaced apart from the curved part formed at both ends of the boundary line O between the coating part 111 and the electrode tab 112 by a predetermined distance.
  • the crack diffusion prevention hole 131 of the crack diffusion prevention unit 130 is formed in a size of 0.5 to 2 mm at a point 2.0 mm to 5.0 mm apart from the curved portion 113 where the end of the boundary line O is located. .
  • the step (b) further comprises a step of bonding the insulating coating layer 132 to the electrode 110 by simultaneously pressing the upper and lower surfaces of the electrode 110 on which the insulating coating layer 132 is located, and Accordingly, the bonding strength between the electrode 110 and the crack diffusion prevention unit 130 may be increased.
  • step (b) after manufacturing the insulating coating layer 132 on the electrode, the process of coating the reinforcement coating layer 133 along the boundary line between the coating part and the electrode tab. Further, it is possible to greatly reinforce the strength of the electrode located at the boundary line O, and in particular, it is possible to remove the step formed at the boundary line O, thereby preventing damage to the separator facing the electrode.
  • Step (c) is for manufacturing the electrode assembly, and the electrode assembly 100 is manufactured by alternately stacking the electrode 110 and the separator.
  • Step (d) is for manufacturing a secondary battery, and the electrode lead 200 is coupled to the end of the electrode tab 112 included in the electrode assembly 100, and the end of the electrode lead 200 is drawn out.
  • the finished secondary battery 10 can be manufactured.
  • the electrode assembly 100 includes a crack diffusion prevention part 130 including a crack diffusion prevention hole 131 and an insulating coating layer 132 . .
  • the crack diffusion prevention hole 131 is provided in an elliptical shape at the boundary line O between the coating part 111 and the electrode tab 112 .
  • the insulating coating layer 132 is also provided in an elliptical shape.
  • the crack diffusion prevention unit 130 of the electrode assembly 100 can effectively block cracks occurring at the boundary line O between the coating unit 111 and the electrode tab 112 . .
  • the crack diffusion prevention hole 131 may be provided in a geometric shape connected only by a curve, and accordingly, the shape of the crack diffusion prevention hole is adjusted to fit the boundary line O between the coating part 111 and the electrode tab 112 . can be adjusted
  • the electrode assembly 100 includes a crack diffusion prevention part 130 including a crack diffusion prevention hole 131 and an insulating coating layer 132, as shown in FIG. , the insulating coating layer 132 includes an inner coating portion (132a) and an outer coating portion (132b).
  • the outer surface of the outer coating portion 132b has a gear shape in which grooves and protrusions are alternately formed. That is, when the crack diffusion prevention unit 130 introduces a crack generated at the boundary line O between the coating unit 111 and the electrode tab 112 into a groove formed outside the outer coating unit 132b, the crack is coated on the outside. It can be blocked so that it does not spread outside the department.
  • the electrode assembly 100 according to the fourth embodiment of the present invention can greatly prevent the spread of cracks generated in the electrode.
  • the electrode assembly 100 includes a crack diffusion prevention part 130 including a crack diffusion prevention hole 131 and an insulating coating layer 132 . .
  • the crack diffusion prevention part 130 further includes a reinforcing coating layer 133 coated on the boundary line O between the coating part 111 and the electrode tab 112 and connected to the insulating coating layer 132 . .
  • the reinforcing coating layer 133 may be formed of the same material as the insulating coating layer 132 .
  • the reinforcing coating layer 133 may be formed of SBR (tyrene-butadiene rubber) or CMC (Ceramic Matrix Composite), thereby minimizing the reaction with the electrolyte inside the secondary battery, and peeling from the tab during charging and discharging. can prevent
  • the electrode assembly according to the fifth embodiment of the present invention can prevent cracks by reinforcing the strength of the boundary line O between the coating part 111 and the electrode tab 112, and in particular, the coating part and the electrode By removing the step difference between the tabs, it is possible to prevent damage to the separator facing the electrode.
  • a secondary battery including an electrode assembly, an electrode lead, and a battery case is prepared.
  • the electrode assembly includes an electrode and a separator
  • the electrode includes a coating part and an electrode tab
  • the electrode lead is coupled to the electrode tab.
  • a crack diffusion prevention hole is provided at the boundary line between the coating part and the electrode tab to prevent crack diffusion.
  • Experimental Example 1 has a structure in which the insulating coating layer is excluded from the secondary battery described in the second embodiment of the present invention.
  • a secondary battery including an electrode assembly, an electrode lead, and a battery case is prepared.
  • the electrode assembly includes an electrode and a separator
  • the electrode includes a coating part and an electrode tab
  • the electrode lead is coupled to the electrode tab.
  • a crack diffusion prevention hole is provided at the boundary line between the coating part and the electrode tab to prevent crack diffusion.
  • Experimental Example 2 has a structure in which the insulating coating layer is excluded from the secondary battery described in the second embodiment of the present invention.
  • a secondary battery including an electrode assembly, an electrode lead, and a battery case is prepared.
  • the electrode assembly includes an electrode and a separator, the electrode includes a coating part and an electrode tab, and the electrode lead is coupled to the electrode tab.
  • Experimental Example 3 is a secondary battery in which only a crack diffusion prevention hole 131 is formed at the boundary line between the coating part and the electrode tab to prevent crack diffusion, and a secondary battery including a crack diffusion prevention hole 131 and an insulating coating layer 132 After preparing the electrode tab of the secondary battery, the effective stress is tested by applying tension along the X-axis, which is the width direction, or the tension along the Y-axis, which is the lengthwise direction, of the secondary battery.
  • the insulation coating minimizes the reaction with the electrolyte inside the secondary battery, and it is necessary to choose a material that does not peel off the tab during charging and discharging. with a thickness of 15 ⁇ m. As a result, a result as shown in FIG. 13 can be obtained.
  • FIG. 13(a) shows that tension is applied along the X-axis
  • FIG. 13(b) shows that tension is applied along the Y-axis.
  • Experimental Example 3 can reduce the effective stress generated on the electrode tab when the insulating coating layer is further included, and as a result, crack generation and diffusion can be prevented.
  • a secondary battery including an electrode assembly, an electrode lead, and a battery case is prepared.
  • the electrode assembly includes an electrode and a separator
  • the electrode includes a coating part and an electrode tab
  • the electrode lead is coupled to the electrode tab.
  • a crack diffusion prevention hole is provided at the boundary line between the coating part and the electrode tab to prevent crack diffusion.
  • Experimental Example 4 has a structure in which the insulating coating layer is excluded from the secondary battery described in the second embodiment of the present invention, and a secondary battery having a circular crack diffusion prevention hole and an oval crack diffusion prevention hole secondary battery prepare Then, stress generation is tested by applying tension to the electrode tab of the secondary battery in the X-axis in the width direction or in the Y-axis in the longitudinal direction. As a result, a result as shown in FIG. 14 can be obtained.
  • FIG. 13(a) shows that tension is applied along the X-axis
  • FIG. 13(b) shows that tension is applied along the Y-axis.

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Connection Of Batteries Or Terminals (AREA)
  • Secondary Cells (AREA)

Abstract

La présente invention concerne un ensemble électrode comprenant une partie revêtue qui est revêtue d'un matériau actif d'électrode et une électrode ayant une languette d'électrode sans matériau actif d'électrode, l'électrode comprenant une partie de prévention de diffusion de fissure, et la partie de prévention de diffusion de fissure comprenant un trou de prévention de diffusion de fissure formé dans l'électrode et une couche de revêtement isolante disposée sur la surface principale du trou de prévention de diffusion de fissure.
PCT/KR2020/017874 2019-12-12 2020-12-08 Ensemble électrode, batterie secondaire et son procédé de fabrication WO2021118209A1 (fr)

Priority Applications (4)

Application Number Priority Date Filing Date Title
US17/776,064 US20220384922A1 (en) 2019-12-12 2020-12-08 Electrode Assembly, Secondary Battery and Method for Manufacturing the Same
EP20899074.7A EP4050725A4 (fr) 2019-12-12 2020-12-08 Ensemble électrode, batterie secondaire et son procédé de fabrication
JP2022521495A JP7351454B2 (ja) 2019-12-12 2020-12-08 電極組立体及び二次電池並びにその製造方法
CN202080077556.4A CN114651371B (zh) 2019-12-12 2020-12-08 电极组件、二次电池以及制造该二次电池的方法

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KR10-2019-0165916 2019-12-12
KR1020190165916A KR20210074827A (ko) 2019-12-12 2019-12-12 전극조립체 및 이차전지 및 그의 제조방법

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EP (1) EP4050725A4 (fr)
JP (1) JP7351454B2 (fr)
KR (1) KR20210074827A (fr)
WO (1) WO2021118209A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP7493839B2 (ja) 2020-11-26 2024-06-03 エルジー エナジー ソリューション リミテッド 電極組立体およびこれを含む二次電池

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH1116577A (ja) * 1997-06-26 1999-01-22 Shin Kobe Electric Mach Co Ltd 非水電解液電池
KR100338443B1 (ko) * 2000-03-09 2002-06-05 김성환 배터리용 단자 및 그 제조방법
KR100861716B1 (ko) * 2006-02-13 2008-10-06 주식회사 엘지화학 탭 부위에 슬릿이 형성되어 있는 집전체를 포함하는이차전지
KR20140112609A (ko) * 2013-03-11 2014-09-24 주식회사 엘지화학 양극 탭 상에 절연층을 포함하는 양극 및 이를 포함하는 이차 전지
KR20190030973A (ko) * 2017-09-15 2019-03-25 엘에스엠트론 주식회사 에너지 저장장치

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101812384B1 (ko) 2015-05-11 2018-01-25 주식회사 엘지화학 전극 조립체 및 이의 제조방법
CN205303580U (zh) * 2016-01-22 2016-06-08 宁德时代新能源科技股份有限公司 一种锂离子电池极片及含有该极片的锂离子电池
JP6932694B2 (ja) * 2016-05-27 2021-09-08 三洋電機株式会社 二次電池の製造方法
KR102261683B1 (ko) * 2017-07-06 2021-06-08 주식회사 엘지에너지솔루션 비대칭 노치가 형성된 전극리드를 포함하는 파우치형 이차전지
JP7008247B2 (ja) * 2017-12-06 2022-02-10 パナソニックＩｐマネジメント株式会社 電極板及び二次電池
CN208955123U (zh) * 2018-09-27 2019-06-07 宁德时代新能源科技股份有限公司 二次电池及其电极构件

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH1116577A (ja) * 1997-06-26 1999-01-22 Shin Kobe Electric Mach Co Ltd 非水電解液電池
KR100338443B1 (ko) * 2000-03-09 2002-06-05 김성환 배터리용 단자 및 그 제조방법
KR100861716B1 (ko) * 2006-02-13 2008-10-06 주식회사 엘지화학 탭 부위에 슬릿이 형성되어 있는 집전체를 포함하는이차전지
KR20140112609A (ko) * 2013-03-11 2014-09-24 주식회사 엘지화학 양극 탭 상에 절연층을 포함하는 양극 및 이를 포함하는 이차 전지
KR20190030973A (ko) * 2017-09-15 2019-03-25 엘에스엠트론 주식회사 에너지 저장장치

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See also references of EP4050725A4 *

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP7493839B2 (ja) 2020-11-26 2024-06-03 エルジー エナジー ソリューション リミテッド 電極組立体およびこれを含む二次電池

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US20220384922A1 (en) 2022-12-01
JP7351454B2 (ja) 2023-09-27
EP4050725A4 (fr) 2024-02-28
EP4050725A1 (fr) 2022-08-31
KR20210074827A (ko) 2021-06-22
CN114651371A (zh) 2022-06-21
JP2022552500A (ja) 2022-12-16

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